Re: [AVT] Size of SRTCP authentication tag of AES_CM_128_HMAC_SHA1_32 cipher suite

["Robert R. Gilman" <rrg at avaya.com>]

Take a look at Section 5.2 of RFC 3711.
----------------------------------------------------
Bob Gilman       rrg at avaya.com      +1 303 538 3868

Wyss, Felix wrote:
> RFC#4568 is ambiguous regarding the size of the SRTCP authentication tag 
> for the AES_CM_128_HMAC_SHA1_32 cipher suite.  The table in section 6.2 
> indicates that it should be 80, but section 6.2.2 states: “This 
> crypto-suite is identical to AES_CM_128_HMAC_SHA1_80 except that the 
> authentication tag is 32 bits.”  I did not see anything in RFC#3711 that 
> would indicate that weak authentication tags are not valid for SRTCP -- 
> hence the ambiguity. 
>
>  
>
> Is there consensus on whether the SRTCP authentication tag must always 
> be 80 or whether the table in section 6.2 is in error? 
>
>  
>
> Thanks,
>
> Felix I. Wyss
>
> Interactive Intelligence, Inc.
>
>  
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Audio/Video Transport Working Group
> avt at ietf.org
> https://www1.ietf.org/mailman/listinfo/avt


_______________________________________________
Audio/Video Transport Working Group
avt at ietf.org
https://www1.ietf.org/mailman/listinfo/avt